diff --git a/lib/const.js b/lib/const.js
index 23a5d95..0aaa551 100644
--- a/lib/const.js
+++ b/lib/const.js
@@ -12,8 +12,7 @@ module.exports = {
       TELL_ME_ABOUT: {
         CALL: 'tell me about',
         JASON_MOM: 'jason\'s mom',
-      },
-      SAVE_GIT_NAME: 'link my github name='
+      }
     },
     HELP: {
       CALL: 'help'
@@ -22,6 +21,7 @@ module.exports = {
   OUTPUT: {
     reaction: (result, point, user, reaction) => 'Congratulations ' + result.userName + ' get ' + point + ' points by :' + reaction + ': from ' + user + ' !',
     pointTo: (result, point, user) => 'Congratulations ' + result.userName + ' get ' + point + ' points from ' + user + ' !',
+    reactionCancel: (result, point, user, reaction) => 'Oh... ' + user + ' canceled :' + reaction + ': so Mr.dumbledore take ' + point + ' from ' + result.userName + '.. You have to give the correct answer. :joy:',
     SAY_HELLO: 'Welcome to Hogwarts everyone!\n Now, in a few moments you will pass through these doors and join your classmates. Your triumphs will earn you points. Any rule breaking, and you will lose points. I Albus Dumbledore will award points on your behalf. Just say `5 points to @benc` to award points. If you want to know the best student, just say `professor best student`. Then good luck everyone!',
     getBestStudent: record => 'High score (boy/girl): ' + record.userName + ' with ' + record.point + ' points!',
     getWorstStudent: record => 'Low score (boy/girl): ' + record.userName + ' with ' + record.point + ' points!',
@@ -42,6 +42,7 @@ module.exports = {
       JASON_MOM: 'Not much is known about Jason\'s mom, except that she is thought to be responsible for the great internet unplugging of 2016',
     },
     WHENZERO: 'Hmm... You don\'t have your own points. before giving points to someone, you should answer to other\'s question and get extra points.',
+    cancelWhenzero: (result) => 'Oh... reaction was canceled... but Mr.dumbledore didn\'t take point from ' + result.userName + ' because ' + result.userName + ' don\'t have point.. :joy:',
     FAIL_POINT_TO: 'Well... you can\'t award points to me, the professor.'
   },
   DB: {
diff --git a/lib/controller/awardPoints.js b/lib/controller/awardPoints.js
index ea49c89..a40c40a 100644
--- a/lib/controller/awardPoints.js
+++ b/lib/controller/awardPoints.js
@@ -16,7 +16,7 @@ async function awardPoints(message) {
   }
 
   const userName = await this.convertToUserName(userId);
-  // const user = message.item_user;
+
   if (typeof botName === 'undefined' || typeof userId === 'undefined' || typeof point === 'undefined') return;
   if (userName === botName) return this.slackBot.awardPointsCallback(message, OUTPUT.FAIL_POINT_TO);
 
diff --git a/lib/controller/deductPoints.js b/lib/controller/deductPoints.js
new file mode 100644
index 0000000..387578c
--- /dev/null
+++ b/lib/controller/deductPoints.js
@@ -0,0 +1,41 @@
+const Parse = require('parse/node');
+const { DB, OUTPUT } = require('../const');
+
+async function deductPoints(message) {
+  const fromUser = await this.convertToUserName(message.user);
+  const botName = this.name;
+  let point = 0;
+  let userId = '';
+
+  if (this.isReactionEvent(message)) {
+    point = 10;
+    userId = message.item_user;
+  }
+
+  const userName = await this.convertToUserName(userId);
+
+  if (typeof botName === 'undefined' || typeof userId === 'undefined' || typeof point === 'undefined') return;
+  if (userName === botName) return this.slackBot.reactionCancelCallback(message, OUTPUT.FAIL_POINT_TO);
+
+  const Student = new Parse.Object(DB.STUDENT.CALL);
+  const query = new Parse.Query(Student);
+  query.equalTo(DB.STUDENT.BOT_ID, this.id);
+  query.equalTo(DB.STUDENT.USER_ID, userId);
+
+  try {
+    const results = await query.first();
+
+    if (this.isReactionEvent(message)) {
+      if (results.attributes.point <= 0) {
+        return this.slackBot.reactionCancelCallback(message, OUTPUT.cancelWhenzero(results.attributes));
+      }
+      results.increment(DB.STUDENT.POINT, -point);
+      results.save();
+      this.slackBot.reactionCancelCallback(message, OUTPUT.reactionCancel(results.attributes, point, fromUser.name, message.reaction));
+    }
+  } catch (err) {
+    console.log(err);
+  }
+}
+
+module.exports = deductPoints;
diff --git a/lib/controller/replyWithDumbledore.js b/lib/controller/replyWithDumbledore.js
index fc72cb7..85d7dca 100644
--- a/lib/controller/replyWithDumbledore.js
+++ b/lib/controller/replyWithDumbledore.js
@@ -88,16 +88,6 @@ async function listStudent(originalMessage) {
   this.slackBot.announcePlainString(originalMessage, OUTPUT.getListStudent(record));
 }
 
-function saveGitName(originalMessage) {
-  const Student = new Parse.Object(DB.STUDENT.CALL);
-  const query = new Parse.Query(Student);
-  const gitName = originalMessage.text.split('=')[1];
-  const { user } = originalMessage;
-  query.equalTo('user_id', user);
-  Student.set('GITHUB_NAME', gitName);
-  this.slackBot.announcePlainString(originalMessage, OUTPUT.saveGitName(this.convertToUserName(user), gitName));
-}
-
 function replyWithDumbledore(originalMessage) {
   const text = originalMessage.text.toLowerCase();
 
@@ -105,8 +95,7 @@ function replyWithDumbledore(originalMessage) {
     [INPUT.PROFESSOR.GET_BEST_STUDENT]: () => bestStudent.call(this, originalMessage),
     [INPUT.PROFESSOR.GET_WORST_STUDENT]: () => worstStudent.call(this, originalMessage),
     [INPUT.PROFESSOR.GET_LIST_STUDENT]: () => listStudent.call(this, originalMessage),
-    [INPUT.PROFESSOR.TELL_ME_ABOUT.CALL]: () => tellMeAbout.call(this, originalMessage),
-    [INPUT.PROFESSOR.SAVE_GIT_NAME]: () => saveGitName.call(this, originalMessage)
+    [INPUT.PROFESSOR.TELL_ME_ABOUT.CALL]: () => tellMeAbout.call(this, originalMessage)
   };
 
   Object.keys(parseCase).forEach(key => {
diff --git a/lib/dumbledore.js b/lib/dumbledore.js
index 8875390..62d8da9 100644
--- a/lib/dumbledore.js
+++ b/lib/dumbledore.js
@@ -15,6 +15,7 @@ class Dumbledore {
     this.githubChannel = settings.githubChannel || 'null';
     this.name = this.slackBot.getName();
     this.awardPoints = require('./controller/awardPoints').bind(this);
+    this.deductPoints = require('./controller/deductPoints').bind(this);
     this.replyWithDumbledore = require('./controller/replyWithDumbledore').bind(this);
     this.getUser = require('./controller/getUser').bind(this);
     this.replyWithGithub = require('./controller/replyWithGithub').bind(this);
@@ -102,6 +103,8 @@ class Dumbledore {
     } else if (this.isReactionEvent(message)) {
       if (message.type === 'reaction_added') {
         this.awardPoints(message);
+      } else if (message.type === 'reaction_removed') {
+        this.deductPoints(message);
       }
       this.saveMessage(message);
     }
@@ -145,6 +148,8 @@ class Dumbledore {
 
     if (text.includes(INPUT.POINTS_TO.CALL)) {
       this.awardPoints(message);
+    } else if (text.includes(INPUT.POINTS_FROM.CALL) || text.includes(this.name)) {
+      this.deductPoints(message);
     } else if (text.includes(INPUT.PROFESSOR.CALL) || text.includes(this.name)) {
       this.replyWithDumbledore(message);
     } else if (text.includes(INPUT.HELP.CALL)) {
diff --git a/lib/helper/slackBot.js b/lib/helper/slackBot.js
index c6cf759..484dbfa 100644
--- a/lib/helper/slackBot.js
+++ b/lib/helper/slackBot.js
@@ -6,7 +6,8 @@ class SlackBot extends Bot {
       throw Error('please set token and name of bot');
     }
     super({ token, name });
-
+    this.reactionPointsCallback = this.reactionPointsCallback.bind(this);
+    this.reactionCancelCallback = this.reactionCancelCallback.bind(this);
     this.awardPointsCallback = this.awardPointsCallback.bind(this);
     this.announcePlainString = this.announcePlainString.bind(this);
   }
@@ -20,6 +21,10 @@ class SlackBot extends Bot {
     const channel = await this.getChannelById(originalMessage.item.channel);
     await this.postMessageToChannel(channel.name, message, { as_user: true });
   }
+  async reactionCancelCallback(originalMessage, message) {
+    const channel = await this.getChannelById(originalMessage.item.channel);
+    await this.postMessageToChannel(channel.name, message, { as_user: true });
+  }
 
   async announcePlainString(originalMessage, message) {
     const channel = await this.getChannelById(originalMessage.channel);
diff --git a/spec/helperSpec.js b/spec/helperSpec.js
index 59a8567..bcaa5ce 100644
--- a/spec/helperSpec.js
+++ b/spec/helperSpec.js
@@ -33,6 +33,7 @@ describe('In helper', function () {
 
   it('Any functions should not be `undefined` in slackBot', () => {
     expect(slackBot.reactionPointsCallback).toBeDefined();
+    expect(slackBot.reactionCancelCallback).toBeDefined();
     expect(slackBot.awardPointsCallback).toBeDefined();
     expect(slackBot.announcePlainString).toBeDefined();
     expect(slackBot.getUserList).toBeDefined();