Restart

Both BL dramas have the type of plot of messy relationships, manipulation and backstabbing among a group of university school friends.

Both are school BL dramas that showcase schools with a strict sense of rules and hierarchy. There is some mystery and secrets to be solved in both schools.

Restart is very very similar to Hierarchy in that both are school dramas that showcase a strict set of rules and strong class differences between the elite students and the ordinary/poor students with the elite students bullying the poor students. There is a sense of mystery and secrets to be uncovered in both schools.

In fact, Restart seems to be a Thai BL version of Hierarchy, which is a Korean version of the Spanish series Elite.

Both are set in oppressive school systems with their own unique set of rules. Both showcase class struggles between characters even though High School Frenemy is set in an ordinary school and Restart is set in an elite school.

Both are school series set in an elite school and with rich students that are also bullies. However, F4 has a girl as the main character while Restart has a guy. Also, F4 is a straight series while Restart has BL content. Restart also has some supernatural/game elements.

Both are Thai BL dramas that have the main characters that died and are revived again to re-live their lives as indicated by their similar titles. Both dramas have dark mysteries to be solved as to why the main character died in the first place.