Both dramas are showing protagonist who is struggling with sports career,but with hard work manage to achieve something.
Both have comming of age/slice of life vibe (25-21 is more sad tho)
Both are having sad and very funny moments
And both have nice slow burn romance

Vampires are topic and vibe is very simmilar. Both are romantic with comic moments.Out of all vampire drama those two are the most simmilar.