Which TV series do you think ends in comedy on the surface, but actually ends in tragedy?

At the beginning of the play, the donkey got water and everyone was happy. Every teacher has his own characteristics and jokes, and his characters are very distinct. In the later period, everyone became unscrupulous for their own pursuit, especially the coppersmith who was hurt by feelings. From being simple and honest at the beginning to being "led astray" by the teacher, he became greedy for fame and fortune and unscrupulous for revenge. The headmaster is also selfish, and he is serious about the education of the country, but he sacrificed his daughter's happiness in order to deceive the Commissioner and the godfather.