Could be that there's some sort of connection or misunderstanding. Maybe she needed a place to stay or was looking for someone and ended up there by accident.
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.
You can start by thoroughly cleaning and vacuuming your house. Make sure to wash all the bedding and fabrics. Also, use appropriate pesticides or insecticides, but be careful to follow the instructions.
You can start by getting rid of any potential sources of mange. Wash all bedding and fabrics in hot water. Also, consider using pest control products specifically designed for mange. It might take some time and multiple treatments, but be persistent.
I wouldn't recommend looking for ways to get manhwa for free. This kind of behavior can have negative consequences. Instead, explore legal options like subscribing to authorized services or borrowing from libraries that offer manhwa.