In "Hwajung" Kim Yeo Jin warned Cha Seung Won to be careful of Jo Sung Ha.
On the 11th episode of the periodical MBC drama "Hwajung" (script Kim Yi Young, director Kim Sang Ho, Choi Jung Kyu) broadcast on May 18th, Kim Kae Shi (played by Kim Yeo Jin) warned Kwang Hae Goon (played by Kim Yeo Jin) about the dangers of Kang Joo Sun (played by Jo Sung Ha).
After this, Kwang Hae Goon asked Kim Kae Shi, "Doesn't that person have no interest in power and getting authority?" Listening to this, Kim Kae Shi said something very vague. She said, "At times, the real enemy could be acting as if they are your friend and may be hiding."
At that time, Joo Sun was meeting none other than Lee Yi Chum (played by Jung Woong In.) Lee Yi Chum's connection had said that because Kang Joo Sun had made a lot of money, he must've done a lot of unethical acts. He even said, 'If he's someone that's so clean, so clean that you could shake him and nothing would come out, that is really scary." With that, Lee Yi Chum contributed to making the vibe eerie which changed the pace of the drama.