Yeah, supposedly the character lost weight after the hardships of his mission in the North. The actor looks really younger tho. Maybe it's indeed the weight/ botox? and better makeup. Idk, but it's very evident. Good for him for staying healthy and pretty.
Funny how the most complex and interesting character turns out to be Zhang Tian Qiang. He's not a typical good guy protagonist, but at least his character has some development and he seems more real and not just a mask.