One thing that bothers me is the lack of physical description for the main character. We know he was 24, 178cm, 130 pounds, thin. After the potion, he becomes muscular and handsome. But we don't know his hair color, eye shape, or distinguishing features. He's a generic "handsome male lead." In contrast, Lin Paopao gets more description (white shirt, great chest, delicate face). The disparity is annoying. I want to imagine the protagonist clearly. The author could have given him something like "sharp eyebrows" or "bright eyes" – oh, they did say "bright and piercing eyes." That's a start. But more would be nice. Details like his hairstyle, skin tone, outfit after the shower. The story fails to paint a vivid picture of the person we're supposed to identify with. That's a minor flaw, but it affects immersion.