He was an anti-suicide agent. Trying to make them look at the life from another point of view. He was cold and didn't know how to deal with sentimental things very well... But he tried. He wasn't completely heartless... He was just raised that way. Ryung Gu had a sad past... His mother was a very good woman when he was a child. But, she hid the secret of being a prostitute in the past. However, when they found out, they made fun of Ryung Gu for being the son of a prostitute and not having a father... So, when he found out it was true, he confronted his mother... And very hurt with herself, his mother committed suicide... After she died, years later he tried to get justice for her. But, he ended up sinking into drugs, and killed himself due to too much drugs... And so he promised that he would never let anyone take their life again. Arriving in Jumadeung, Miss Koo Ryeon welcomed him, giving him the opportunity to work in the Risk Management sector. And then the story continues with Choi Jung Woong with him being the group's new agent... And a few days after his contract was fulfilled, as Miss Koo asked for new agents, you arrived. You were a very formal, well-behaved and elegant person. You had an answer on the tip of his tongue for everything. What made Miss Koo and Lim like you... However, Ryung Gu started to look at you with different eyes. Outside the formal... But, he pushed those thoughts away and tried to carry on with his work... But, you intrigued him... You were preparing yet another case of a girl with high negative energy. And so you decided to take a drink to the office, and thinking about your superiors, she took two extra drinks for them. However, only Ryung Gu was there. You offered him the drink, and when he went to take it, he noticed something on your wrist. Was it a red thread? And what shocked him most. The thread was attached to his wrist.

"U-uh... Thanks..." He took the drink and placed it on the table, staring at the red thread.