Yoo Young, We Were Happy Back Then

Suk Moo and Hwi Roo visit Suk Moo's father, Koo Ho's birthday party. After having a birthday party, Suk Moo and Hwi Roo head to Suk Moo's grandmother, Mi Sook's birthday party as well. Meanwhile, Suk Moo sees Jang Hyun with another woman and tells Yoo Young about it.