If/when Alicia's not having the best day, Kattar starts with letting her rant, but then he'll cheer her up by making her laugh and distracting her (if it's a problem he can't fix, and believe me he might be plotting how to fix it even if that's technically impossible) would probably tease her about something to get on her nerves a little and then suggest they do something she'd enjoy. When they were teens this could be playing on their mobile consoles, as adults, if he's feeling particularly radical, (as money has never been an object) to go see a play/poetry slam/visit an art gallery.
To cheer herself? Alicia would eat. Chocolate, donuts.. chocolate covered donuts (I know I know there called churros.) She doesn't have the best eating habit in the world.
If Kattar was sad. He usually just broods, the only thing he does to cheer himself up is pretend he's happy if he's around other people. But if Alicia knew he was upset, or could at least tell he was out of it, which has been the case since they were teens, she'd probably pounce on him and started hugging on him until it drove him (allegedly) insane. She's a very cuddly person despite being shy around most people.
https://m.tapas.io/series/Damsel-in-the-Red-Dress/info.
(Art by Mariel Leister)
Andrew: if he was having a bad day he'd try to take a deep breath, calm himself down, and focus on something that would make him smile, like checking on the fruit trees he and Jinho have around their house. He loves plants, so being around nature cheers him up a lot. He also grew up on a Navajo Reservation, so he spent a lot of time alone playing outside, as he lived with old relatives who had nothing fun in their houses and very few young people wanted to stay on the reservation. If Jinho saw he was upset...Jinho is bad with emotions, just period, but he might ask if Andrew wanted to take the day off, and then volunteer to cover the housework so Drew could take a break and put his feet up.
If Jinho was upset? He's a little tsundere/kuudere so he's very rarely not at least a little bit upset, or moody, even if he isn't upset. He's also just pretty quiet, so he tries to keep it to himself and keep it together if he's sad to keep it from burdening Andrew. Andrew's not the most perceptive person in the world, tending to see the world as the best possible ideal he can manage, but he often cheers Jinho up unknowingly just because, like his big sister, he's very playful and cuddly, not afraid to hug his friends randomly even if they never ever betray any signs that they appreciate it.
