Yes. My Demon originated from a manhwa and has made certain changes to fit the medium of the adaptation. But the core elements and storylines are drawn from the manhwa source.
Well, first of all, they often have a clear leveling system. Just like in games, characters can gain experience and level up, which usually means they get stronger, gain new abilities or skills. For example, in 'Solo Leveling', the main character's leveling process is a major part of the story. Another characteristic is the existence of quests or missions. The characters need to complete these tasks to progress in the story, similar to how it is in games. And there are often stats like strength, intelligence, etc. that can be improved.
Well, you could try doing things he likes together to strengthen the bond. Also, showing appreciation and support for him can go a long way. Sometimes, small gestures of love and care can make a big difference.
One way could be to have heart-to-heart conversations regularly, listen to his perspective, and work on resolving any conflicts together. Surprising him with small gestures of love and support might also make a difference.