"I'm envious!" Liam replied. He actually also has an interest in music. Hence, the reason why his new home also has a music room with various instruments
It's just that he feels like he is not good at anything and he can only admire people that have the talent
Although Liam was envious, it was a 'pure envy' if there is even something like that. He just genuinely wants to have the same talent as Tristan but he didn't really mean anything negative
"I can teach you" Tristan offered. The reason why he had just arrived was that Roy talked to him
The man asked him to take care of his child well before going off to do some work
Although Liam was pampered, his father still runs a big business. In emergencies, Roy would push out all of his work but if there is none, most of it would be spent doing work
Roy can only ask Liam's friends to take care of his son for him