On the 8th episode of the KBS 2TV drama 'Big' that was aired on the 26th of June featured Jang Mari (miss A's Suzy) finding out about Gil Choong Sik's (Baek Sung Hyun) secret porn stash under his bed while they were at his house together.
While Jang Mari was with Kil Choong Sik at his house, his mom Lee Jung Hye (Yoon Hae Young) scolds Choong Sik to clean up his secret porn stash under his bed. Jang Mari, who heard the whole conversation, laughs in his face and leaves.
Embarassed and hurt, Gil Chong Sik takes his piggy bank that contains about $100 and runs away from home. Kang Kyung Joon (Shin Won Ho) in Seo Yoon Jae's (Gong Yoo) body tells Jang Mari, 'Mari, Gil Choong Sik ran away from home. We have to find him so get all his close friends together as soon as possible.'
Many people gathered for the search to find Gil Choong Sik including a gym teacher, Na Hyo Sang (Moon Ji Yun), who is in love with Gil Da Ran (Lee Min Jung). They begin searching everywhere, from Seoul Station to all the nearby streets but he is nowhere to be found. Eventually, Kang Kyung Joon in Seo Yoon Jae's body finds Gil Choong Sik hiding in a public sauna.