You make it seem like Yeonwoo is the only one who needs to be changed or like he’s the only one that’s wrong here. I really get your point but Haesol also needs a development, she just cannot just stay like that also. They are dating that’s why she also should consider how he feels knowing the facts that she knows what his personality was like. Just wait and let them develop their characters, both needs to change, really.
If you look at some of my other comments and replies, you'll see that I also talk about Haesol needing to be more proactive in her communication. She doesn't need to change her whole personality and become more emotional, it can work if she communicates with the Yeonwoo, which luckily she does in the most recent chapter.
Fuck, I might actually start rooting for Haesol with green haired guy. At least they have banter in their relationship. I'm not seeing any chemistry from her and Yeonwoo. He needs to get over his insecurities before dating. She's not an emotional therapist and she won't know how he's feeling unless he voices his own thoughts and opinions.