1x8 - The Forbidden Marriage

So Rang believes that Heon still confuses her as the late Crown Princess. Although her love for Heon is sincere, she does not want it unless Heon feels the same way for her. Just as Heon is trying to prove that he also truly loves her, an attack on the Palace occurs. Chun Seok and Shin Won become severely hurt by the attack and leave Heon in danger.