Help find a manga/anime

The MC was invited to be a royal tutor to like 4? i think princes to prep them to compete for the throne. The MC is often commented to be short, it's one of the few things that tick him off, and is also an alcoholic from what I remember. The MC was a close friend of the king when they were children and is doing this tutoring git as a favour I think. I also remember some details about the prince: there was a particularly tsundere one, a kuudere one who has a love for animals but is terrible with facial expressions (there was an entire episode dedicated to this plot point), one sneaked off to work in a cafe and the last one was a glassed-up bookworm. I have some more information but I hope these are enough