S1 • E1
Seo Yi Soo and Kim Do Jin keep meeting each other in the least expected ways and places. Do Jin deduces Yi Soo is in love with Tae San, a mutual friend.
S1 • E2
Because of Me Ah Ri's, Tae San's younger sister, meddling, Yi Soo is forced to make a false declaration of love to Do Jin in front of Tae San.
S1 • E3
After Yi Soo makes the false declaration of love to Do Jin, she ignores his calls and messages. Do Jin declares that he will have one-sided love towards Yi Soo.
S1 • E4
Jung Rok swallows his wedding ring. Yoon accidentally lets Do Jin know he likes Mae Ri. Se Ra, after seeing Tae San's yearbook photo on Yi Soo's possession, realized the man Yi Soo likes is Tae San.
S1 • E5
Se Ra catches wind of Yi Soo's feelings for Tae San and tries to get her to admit it.
S1 • E6
Because of her jealousy, Se Ra reveals to Tae San who is Yi Soo's unknown crush. Do Jin kisses Yi Soo.
S1 • E7
Tae San tells Yi Soo he likes Se Ra a lot. Se Ra tells Yi Soo she knows she likes Tae San. Yi Soo tells Do Jin she will start dating younger guys. Yoon is jealous because he keeps seeing Maeahri with Colin.
S1 • E8
Me Ah Ri publicly confesses her feelings for Yoon, putting Tae San and Yoon in an awkward position.
S1 • E9
Do Jin is happy to see Yi Soo wearing his gift until he thinks she's falsely declaring her love for him again. Unbeknownst to both of them, Yi Soo is actually falling for him.
S1 • E10
After misunderstanding Yi Soo's intentions for him, Do Jin has decided not to see Yi Soo again. However, Yi Soo realizes her feelings for him and tries to straighten everything out.
S1 • E11
Do Jin and Yi Soo manage to clear the air, but Do Jin wants to balance out the relationship. In order to even the score, Do Jin creates a checklist of one-sided tasks for Yi Soo to complete.
S1 • E12
Tae San and Se Ra find themselves at odds and end up getting into the biggest fight of their relationship. This fight may just be the one that ends their relationship for good.
S1 • E13
The guys decide they can't ignore Colin anymore and set out to send him back to Japan.
S1 • E14
As each person wonders about Colin's paternity, each couple experiences their own set of misunderstandings and unnecessary accusations are thrown. Ultimately, it is Yi Soo's relationship with Do Jin that suffers the most.
S1 • E15
Yi Soo is still hurting from Do Jin's decision to end their relationship, but she's in the mood for revenge. Jung Rock, Tae San and Yoon are adjusting to having a new nephew but end up accidentally embarrassing Colin.
S1 • E16
Yi Soo struggles to come to terms with Do Jin's situation; meanwhile she becomes Colin's new homeroom teacher.
S1 • E17
Yi Soo puts all her faith into Do Jin returning to her, one last time.
S1 • E18
When Yoon is finally able to confess his feelings for Mae Ah Ri, Tae San is angered enough to disown them both. Do Jin is able to impress Yi Soo's coworkers by treating them to dinner but ends the night with Yi Soo. (DramaFever)
S1 • E19
Although he was initially angry, Tae San is conditionally willing to accept his sister's relationship. After filing for divorce from Rok, Min Sook throws Mae Ah Ri a bachelorette party.
S1 • E20
Yoon and Meari's wedding. Jungrok try to win Minsook back. Dojins proposal to Yisoo. Sera fainted because she's pregnant but will not get married until she delivered the baby.
S1 • E21
Kim Do Jin
Seo Yi-soo
Im Tae San
Choi Yoon
Park Min-sook
Im Me Ah Ri
Kim Dong Hyub
Lee Jung Rok
Hong Se Ra
Collin