In his isolation Joon Pyo turns to Ji Hoo but can't articulate his position, yet the action rights the shaken F4 friendships at least for now. Jae Kyung, a new student at Shin Hwa University, invites herself to overnight at Jan Di's (unknowingly copying Joon Pyo's past action). Since "little sister" Jan Di is the first friend she's ever made, Jae Kyung asks her to be her romantic advisor in strengthening ties with Joon Pyo, whom she's decided she's meant to marry someday. Yi Jung and Woo Bin resolve to step in before this arranged marriage becomes permanent, and they link up with Ga Eul to trick Joon Pyo and Jan Di back together by making it seem Yi Jung has targeted Ga Eul for his latest sexual conquest. Fate intervenes at the worst possible moment by bringing Hee Soo into the picture. Meanwhile, Jan Di also becomes aware of the relationship and estrangement between Ji Hoo and Dr. Yoon.
—statmanjeff