On the 21st episode of KBS 2TV "Bluebird House" (script Choi Hyun Kyung, director Ji Byung Hyun) broadcast on May 2nd, Kim Ji Wan (played by Lee Joon Hyuk) learned that Han Eun Soo (played by Chae Soo Bin) and Jang Hyun Do (played by Lee Sang Yeop) were dating. Here, Kim Ji Wan was worried about Han Eun Soo because he said, "I don't know when Jang Hyun Do (played by Lee Sang Yeop)'s heart will change.
On this episode, Chae Soo Bin started to talk to Lee Joon Hyuk about his feelings towards Lee Sang Yeop. With that, Lee Joon Hyuk allowed Lee Sang Yeop to date Chae Soo Bin.
Han Eun Soo said, "I like him. I don't know how my heart will change but at least I like him." Kim Ji Wan's expression started to get crumbled, as he was upset.
The next day, Jang Hyun Do met Kim Ji Wan at the company the next day. Jang Hyun Do said, "Really, am I not okay? People change. I know I've just lived without thought. But please give me a chance" she said. Kim Ji Wan ended up caving in. He also said, "If you play with my sister's heart, I'm not going to let you be."
