Viral

1 Prologue 

2 Search by Joon Woo 

3 A Father's Effort 

4 Tormented 

5 Cruel Destiny 

6 Second Chance 

7 I'm Back ...! 

8 Kim Youra's Persuasion 

9 The Next Plan 

10 Chung-Hee 

11 Best Friends 

12 Maths Teacher 

13 Trapped 

14 Bad Intention 

15 A Tragedy 

16 Experiencing Bullying 

17 Silhouette 

18 Feeling Scared 

19 New Friends 

20 Forced to Lie 

21 Chung-Hee's Help 

22 Misunderstand 

23 Chung-Hee's Mother 

24 Strict Mother 

25 Danger Signs 

26 Tell It 

27 My Father Is My Hero 

28 Pain 

29 Love Each Other 

30 Strange-Sounding Statements 

31 Hard to Understand 

32 The Injured 

33 Often? 

34 Here's A Friend 

35 Go Home Together 

36 Licking Your Own Spit 

37 Rain's Interest 

38 Special? 

39 The Broken Smart Phones 

40 Star Is Here 

41 Upsetting Debate 

42 Subtle Whispers 

43 Late 

44 New Acquaintances 

45 Who's Outside? 

46 Looks Different 

47 What's Wrong with Chung-Hee? 

48 The Strange Chung-Hee 

49 Secret 

50 They're Lovers 

51 Useless Quarrels 

52 An Anger 

53 Inhumane 

54 Important 

55 Aware 

56 Stay a Secret 

57 The First Step 

58 A Clichéd Plan 

59 Don't Expect 

60 Ae-Ri's Anger 

61 Surprise 

62 Glimmer of Light 

63 Early Instructions 

64 Chung-Hee's Grief 

65 Crazy Thing 

66 Date? 

67 A Question 

68 Awkward Situation 

69 A Confession 

70 Chung-Hee's Sick?! 

71 The Help 

72 Two Ghost 

73 Physician Bae 

74 Physician Bae [Part II] 

75 A Story 

76 Forever?! 

77 I Love You, Dad ...! 

78 Goals 

79 Jealousy #1 

80 Hatred 

81 Canteen 

82 Viral 

83 Baek Hyeon (Part 1) 

84 The Culprit (Flashback) 

85 Baek Hyeon (Part 2) 

86 Baek Hyeon (Part 3) 

87 Baek Hyeon (Part 4) 

88 Yong Jin 

89 Baek Hyeon (The Truth) 

90 Thank You 

91 Jealousy #2 

92 Misspoke 

93 That Sense (Chung-Hee) 

94 That Sense (Ahn Hyun Ki) 

95 Hyun Ki's Feelings 

96 Monitored 

97 Forgiveness and Acceptance 

98 Like Each Other? 

99 Farewell 

100 That Sense #3 

101 Sorry? 

102 Tenuous Friendship 

103 The Meaning of Forgiveness 

104 Deja Vu? 

105 [Not] Accidental Meeting 

106 Bully (Part 1) 

107 Bully (Part 2) 

108 Bully (Part 3) 

109 Bully (Part 4) 

110 The Helper 

111 Joon Woo (Part 1) 

112 Joon Woo (Part 2) 

113 Jealousy #3 

114 Assent 

115 Deal 

116 Working Day 

117 Moon's Ignorance 

118 She's Here 

119 Enemy 

120 An Incident (Part 1) 

121 An Incident (Part 2) 

122 An Incident (Part 3) 

123 Wounds and Hope 

124 An Effort 

125 Absolute 

126 Illegal Auction (Part 1) 

127 Illegal Auction (Part 2) 

128 Illegal Auction (Part 3) 

129 The Struggle (Part 1) 

130 The Struggle (Part 2) 

131 An Impossibility 

132 Important Things 

133 Hard to Believe 