"You're the Best Lee Soon Shin" IU decides to live with her biological mother Lee Mi Sook.

June 29, the 33rd episode of the KBS drama "You're the Best Lee Soon Shin" featured Lee Soon Shin (IU) deciding to move in with Song Mi Ryung (Lee Mi Sook) after finding out that Lee Chang Hoon (Jung Dong Hwan) is not her real dad.

Lee Soon Shin is completely shocked after learning the truth about her father and decides to drink with Shin Joon Ho (Jo Jung Suk). Lee Soon Shin had left her cellphone at Song Mi Ryung's place before she went out to drink so when Lee Yoo Shin (Yoo In Na) calls the next morning, Song Mi Ryung answers. Song Mi Ryung tells her, "Soon Shin is here. It's not like this isn't somewhere she shouldn't be."

Lee Yoo Shin gets furious and says, "Now she just sleeps there without even saying anything. How could she do this?" Later when Lee Soon Shin wakes up in Shin Joon Ho's office, she asks him to take her to Song Mi Ryung's place.

Lee Soon Shin tells Song Mi Ryung, "I'll stay here from now on. I'll do what you tell me to do. In exchange, don't tell my family that I am not my father's real daughter."

Soon after, Lee Soon Shin asks about her real dad but Song Mi Ryung just hesitates without an answer.