1x1 - Family by Choice

A family of three moves into the Oryun Mansion Complex, and Ju-won meets San-ha, the brother she always wanted, for the first time. Despite Ju-won's eager wish to get to know him, San-ha has trouble accepting her due to his family's situation. Meanwhile, San-ha's father meets Kang Seo-hyun, a single mother with a son named Hae-joon.