Love Buzz is a high school drama and whilst Tomorrow with You is adults. They both envoles around time traveling and love. I recommend Love Buzz more because I feel like the leads had a stronger relationship despite being such a short drama.
Both are sad romance short movies in which time plays a role, in the library theres alot of focus on time progression and in love buzz the male lead travels back in time. The twists in both are quite similar too.
Both are short stories that are about one of the leads traveling to their past to change the other's fate. Both have the same melancholy tone and looping ending.
Both feature a male lead that travels back to the past and ends up being involved in a romance story. He supposedly comes to kickstart the romance between his parents (theres more to love buzz however...)