Hye-sung and Dojin's relationship may be rock solid, but that doesn't mean a few shake-ups can't happen from time to time. From a workplace quickie to a confrontation with an ex-flame of Hye-sung's, the drama hasn't completely disappeared from their lives just yet. Even their friends aren't immune. When Heesoo manages to rile up the usually unflappable Dojun over a discussion about children, will they be able to get past their differences of opinion and make up? And how will Kyungsoo handle meeting Chowon's toxic family, who can't fathom why Chowon would date a beta, of all people?