Suddenly? He's been sensible since the first time he appeared.
He’s always been from the first moment he appeared.
Chanwoo has the most sensible personality since he was introduced, but we also have to keep in mind that he's been out and openly gay for a while and has come to terms with his sexuality, the world around him, and where he fits in among it, and al from a young age. He probably went through a lot of shit growing up knowing he was gay from an early age. His parents accepted his sexuality, he lost friends, he gained friends, and he may have made as many mistakes in his past as DG and Alex, but he has had a time to work through them to the confident and self-assured, sensible gay man that he is currently. So yeah, he gets it. However, DG is just discovering that stuff, as is Alex in terms of being gay, same sex relationships and romance, and not just sex. So, if we're comparing EXP points, Alex and DG are noob beginners and Chanwoo is mega veteran master player x100000 points
How is Chanwoo suddenly the most sensible person in this manhwa??