- IU as Lee Soon Shin
- Go Doo Shim as Kim Jung Ae
- Jung Dong Hwan as Lee Chang Hoon
- Kim Yong Rim as Shim Mak Re
- Son Tae Young as Lee Hye Shin
- Yoo In Na as Lee Yoo Shin
- Jo Jung Suk as Shin Joon Ho
- Kim Gab Soo as Shin Dong Hyuk
- Go Joo Won as Park Chan Woo
- Lee Mi Sook as Song Mi Ryung
- Kim Yoon Seo as Choi Yun Ah
- Jung Woo as Seo Jin Wook
- Lee Ji Hoon as Kim Young Hoon
- Lee Ji Hoon as Jo In Sung
- Yoon Da Hoon as Hwang Il Do
- Bae Geu Rin as Shin Yi Jung
Chan-woo’s mom tells Soon-shin’s mom to forget the past. Mom drinks a lot. On her way, she sees Soon-shin coming out of Joon-ho’s car. She also sees that Mi-ryung is there, who returns back her scarf.
Mi-ryung tells Joon-ho that recently he has changed. Also that she finds Soon-shin cute and pretty.
Mom is very angry. She slaps Soon-shin and tells her to leave the house. Everyone stops her but she doesn’t budge. Soon-shin spends the night at her practice room as she had the key for it.
In the morning, everyone is worried because of mom’s behavior.
In-sung tells Joon-ho about Soon-shin sleeping in the practice room. He gives her script for the audition, which is a romantic one.
Chan-woo comes to Yoo-shin’s office with lunch. He tells her that Joon-ho is their director’s son.
Yun-ah comes to see Joon-ho’s father’s clinic and takes membership.
Yi-jung comes after skipping many classes with a cake. But Mi-ryung again tries to discourage her by saying that there are many girls who are far more talented than her. Finally, Yi-jung decides to quit.
Yoo-shin and Woo-joo are unhappy to see Jin-wook as the man who will take their room for rent.
When Joon-ho sees that Soon-shin is not acting properly during practice and that she has never been in a relationship, he takes Soon-shin to a club where people who suffered break-up meet to cure and heal their wounds of past love. He also talks about his experience and becomes a bit emotional.
Soon-shin asks Joon-ho that his story was true, but he refuses and says he made it up.
Mi-ryung asks Yun-ah that are there any feelings left in her for Joon-ho.
Mi-ryung’s manager sees mom at the police station when both of them went to see the witness for Soon-shin’s dad’s accident. But he turns out to be a wrong one. The manager tries to remember where he has seen her.
Finally, manager Wang remembers that he had seen mom outside Mi-ryung’s house and prevented her from meeting Mi-ryung. He asks his sources to find about Soon-shin’s dad and his family.
Soon-shin is upset and this is not hidden from Mi-ryung who asks about it. She tells her the whole story. Mi-ryung proposes to talk to her mom. She calls her and they meet at a restaurant.
- You’re The Best Lee Soon Shin (Episode 13)
- You’re The Best Lee Soon Shin (Episode 12)
- You’re The Best Lee Soon Shin (Episode 11)
- You’re The Best Lee Soon Shin (Episode 10)
- You’re The Best Lee Soon Shin (Episode 9)
- You’re The Best Lee Soon Shin (Episode 8)
- You’re The Best Lee Soon Shin (Episode 7)
- You’re The Best Lee Soon Shin (Episode 6)
- You’re The Best Lee Soon Shin (Episode 5)
- You’re The Best Lee Soon Shin (Episode 4)
- You’re The Best Lee Soon Shin (Episode 3)
- You’re The Best Lee Soon Shin (Episode 2)
- You’re The Best Lee Soon Shin (Episode 1)