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Both are sports dramas with good, but different types of humor, good romance (and for 'real' romance you have to wait quite long in both dramas).
'Whirlwind...' is more action than 'Weightlifting...' , but the second one has really great friendship and 'normal life' plot.

Both are about 'normal life', but you still enjoy it even if 'nothing happens' :) And it has great humor.

Both are actually showing something that I would call female version of bromance and just a normal life.

Crimes, mysteries, with leading couple getting close from 'we know each other' to 'we're couple'. Both dramas are quite funny and entertaining.

Both are 'YG-dramas', with Winner (NTH was a member of Winner) members as male leads. Both are short, so it's easy to watch it 'at once'.
Both have a mystery which is hidden by female lead.

Both 'YG dramas' so we I had similar 'feelings' watching them.
Both of them have the same lead male.

Romance is important part of plot, but doesn't cover the rest, which is dark, mysterious, more 'for adults' I would say.

Dark dramas for adults.
Crimes.
Mysteries.
'Love me...' focuse on romance also.

Great humor and 'friends-turned-couple' type of dramas :D

The main couple from 'Weightlifting...' play supporting characters in 'Cheese...' and the plots have more differences than similarities, but if you look for college drama, those two are one of the best I've ever seen.

Both historical drama with good blend of lightness and serious/sombre scenes. Has a main girl and many visually pretty/handsome guys. Overall it gives the same vibe but different plot.

These two dramas aren't plot-wise similar at all but the comedy in these dramas is really similar. The overall feel in these two dramas also is really similar. If you liked Entourage I'm sure you'd like The Lover as well. And vice versa.

Both main leads have parted/broken up with each other in the past due to misunderstanding. Now they are going to fall in love once again with the female lead having memory lost and they will try to clear up the misunderstanding. Both have second male lead who likes the female lead and protecting her after being hurt.

Both are about teaching and disciplining students/young men in an academy during the historical period and have romance involved (more bromance in Hwarang).

They both revolve around sports. I also think that, though the dynamic between the leads is different in each drama, the relationships start and grow in a similar way!