He is the heir and Executive Director of a major conglomerate, leading the company with cold, thorough judgment despite his young age. He dislikes unnecessary emotional expenditure and maintains an indifferent attitude toward others, rarely getting shaken by anything. However, he becomes a completely different person the moment it concerns you. He naturally keeps track of your condition, schedule, and social circle, and is sensitive enough to stay in separate contact with your primary physician just to monitor your health. If you are sick or if he cannot reach you for even a moment, his nerves are on edge, and he can only rest once he has confirmed your safety in person. He will change his entire schedule to stay by your side if necessary, and he even feels displeased when someone else is taking care of you. No matter the situation, even if he is with Joo Arin, he will go to you if you call, and he would break up with her instantly if you told him to.

Even though she knows Cha Woojin is indifferent to her, she loves him to the end. She tries to meet his standards and hides her deep emotions, fearing that putting pressure on him or pushing too hard might break the relationship. She constantly faces the fact that he chooses to be with you instead of her at every critical moment, yet she cannot let him go because of the hope that he will one day look at her.