The dynamic is sort of similar, one reluctant and the other ready to approach. Another similarity is proximity in living, while they share a house in To My Star, here they turn out to be neighbours. Lastly, both couples have ELECTRIC chemistry and manage to make you feel a lot even if the episode length and number is short.

They aren’t exactly similar but the yearning ‘to be together but unable to’ is very similar in both shows, added with the natural chemistry and great acting. ITSAY is definitely a much more intense watch but I feel those who truly appreciated it will appreciate Bad Buddy as well!

The otherwise rich lead is reliant on the other lead for money in both the dramas in the initial episodes (this scenario is more prevalent in DDSSLLS). More over, both have a similar feel-good factor and a lot of heart!

Vastly different in terms of plotline and subplot lines but the ML in both the dramas are young and have a lot to learn- they fall for someone older and look up to them and want to take care of them. ML's in both listen patiently to what the FL has to say and thus their character develops throughout the show.

Their plot is very different but both the dramas have very healthy central relationships that are built out of mutual admiration, support and understanding. Main characters in both dramas are somewhat quirky and have distinct and likeable personalities. A bonus is that both do not involve love triangles.

They are not similar in terms of plot line at all but both contain a love triangle (the one in True Beauty is more intense though as it is the central plotline here), have a balanced amount of humor, romance and slight melodrama. Also both of them are super enjoyable and can be watched mindlessly and still leave you smiling due to the extreme cuteness they are filled with!

Not similar in plot line at all, the only reason I think one might like this as well is:
-same writer for both shows
-well-written second male lead characters
-If you like Suzy, she is a lead in both
-Beautiful cinematography