Han Hyo-joo as Yi-soo

Kim Dae-myung as Woo-jin 1

Do Ji-han as Woo-jin 18

Bae Sung-woo as Woo-jin 33

Park Shin-hye as Woo-jin 43

Lee Beom-soo as Woo-jin 45

Park Seo-jun as Woo-jin 60

Kim Sang-ho as Woo-jin 61

Chun Woo-hee as Woo-jin 64

Juri Ueno as Woo-jin 74

Lee Jae-joon as Woo-jin 75

Kim Min-jae as Woo-jin 78

Lee Hyun-woo as Woo-jin 81

Jo Dal-hwan as Woo-jin 82

Lee Jin-uk as Woo-jin 84

Seo Kang-joon as Woo-jin 92

Kim Hee-won as Woo-jin 93

Lee Dong-wook as Woo-jin 100

Ko A-sung as Woo-jin 101

Kim Joo-hyuk as Woo-jin 109

Yoo Yeon-seok as Woo-jin 123

Lee Dong-hwi as Sang-baek

Moon Sook as Woo-jin's Mother

Lee Kyung-young as Woo-jin's Father

Lee Mi-do as Eun-su

Choi Yong-min as Yi-soo's Father

Shin Dong-mi as Yi-soo's Boss

Kim See-eun as Woo-jin's Mother

Gong Min-jeung as Resident Doctor

Kim Mi-hui as Woo-jin 15

Baek Seung-hwan as Woo-jin 23

Lee Ji-won as Woo-jin 37

Park Keun-rok as Woo-jin 44

Kim Lok-kyoung as Woo-jin 52

Kim Won-jin as Woo-jin 98

Jang Eui-soo as Woo-jin 106

Ko Kyu-phil as Woo-jin 108

Sin Ye-jin as Lounge Girl

Kwak Ji-hyun as Mama Studio Staff

Hong Da-mi as Woo-jin

Moon Kyung-min as Doctor

Kim Tae-hyun as Woo-jin's Father

Woo Yong-hee as Woo-jin 7

Yoon Hwan as Woo-jin 19

Yun Ki-chang as Woo-jin 20

Lee Sang-won as Woo-jin 21

Go Bong-goo as Woo-jin 22

Jeon Young-woon as Woo-jin 26

JJ Graham as Woo-jin 35

Kim Joo-hwang as Woo-jin 49

Jung Young-ki as Woo-jin 72

Jeong Seung-won as Woo-jin 73

Son Seong-chan as Woo-jin 77

Park Min-su as Woo-jin 80

Kim Gwang-seop as Woo-jin 86

Bae Hyun-kyung as Woo-jin 87

Shin Na-ra as Woo-jin 95

Lee Bom as Lounge Woman

Ok Joo-ri as Subway Woo-jin's Father

Ham Tae-in as Snack Cart Woo-jin's Father

Ha Si-yeon as Mama Studio Staff

Yeom Ji-young as Mama Regular Customer

Lee Ji-min as Lounge Woman

Lee Myung-ha as Lounge Woman

Oh A-lin as Woman at Party

Son Seul-gi as Glam Sang-baek Woman

Park Woo-jae as Woo-jin

Ko Dong-hyoung as Sang-baek's Factory Worker

Lee Jin-seong as Doctor

Lee Seung-chan as Woo-jin 103