@Bazooka self etiquette ain’t gonna fill your fridge or stop some gangster to beat ur a$$ or ruin your reputation. He gave him permission stop making it looks like he was stealing or something. At the end of the day he is just a student, he was even struggling to eat a proper meal and walking long distances to save money so he could buy some food. He was in an unhealthy situation and environment so yeah, even if Yeon gave him a bed and a house to live, to ease him a little bit. He could’ve used that money in a logical way.