Another groundbreaking BL which started the careers of many newbies in the industry. Both are high school and coming of age.

TGIF was the spiritual successor to Love Sick. It's based in the same school, Friday College, and has to do with the music band members coming of age.

One of Namtan greatest roles as the baddie of the series
Past deeds affecting the future
Likeable and unlikeable characters in situations affecting each other

Similar stories from the LGBTQ community that are based on true events, with human interactions in relationships with a significant other and other people.

Similar themes of what is the afterlife, spiritual awakening, and revenge from another level.
The only difference is ThirTEEN Terrors is an anthology, with 13 different stories.

Otherworldy powers and their effects on present-day relationships
Destiny and predeterminism in relationships
Strong friendships and bonds among team members

Similar otherworldly powers
Various obstacles in the way of characters' relationship
Past deads playing a role in the present relationship

Sport themed, coming of age, theme sports, learning to live differently, learning team work and society acceptance

Both explore coming of age and budding romance.
Both explore changes in life and how those around react.

Similar thropes of teenaged angst, love, enemies to friends, high school aged characters dealing with life.
Same emotional score with the characters.
Both are very character driven given the situation.

Similar ideas of unrequited love challenge relationships, and not much really goes on to further the story of the relationship. Both will leave you wondering, "What?"

Similar: school-aged players, music-based storylines, unrequited love which becomes mainstream, main character has leadership placed on them