In this episode, Ju Yeon Ae (BoA) is shown throwing small, living octopuses at a past boyfriend after she catches him cheating on her. This earns her the nickname 'Octopus Girl,' which she hides from new love interest, Jung Jin Kook. However, he eventually finds out and goes to confront her, upset about being lied to and feeling insecure about her feelings towards him.
Ju Yeon Ae apologizes and confesses that she is falling for Jung Jin Kook, but understands if he wants to break up. He responds with a sweet kiss--clearly a negative on breaking up--and confesses his feelings in return.
Definitely check out the first episode of 'Hope for Dating' to catch the full romantic scene between BoA and Siwan.