Both dramas have misteries around plane crash and are alike. Action and suspense theme in both with a little romance too.

xx SPOILER ALERT xx
In both shows FL seems to fall for the guy first, but acctualy it is the opposite.
I really enjoyed the fact that they made Jiang Zhi Shu (Irie Naoki) fall for FL first in this version of one of the most adapted manga, Itazura na Kiss.

Both have actresses female leads having issues with fame and its problems. They both are airheads while the MLs are more calculists

I don't know exactly but one show reminded me of another:
Both MLs are not much experienced, they're "inoccents", while the females protagonist act cold and indiferent about they bodies due to some kind of sexual harassment in the past.
The male leads care much even if unconscious for the FL.
While Everythig and Nothing have a sad and mysterious atmosphere, HG'sL is more comedy.
In Ho Goos's Love FL gets pregnant .

First love
Main cuple gets separated due to a family member's accident.
Third Charm have a bittersweet end.

Non-human-human relationship. The leads gets together and separated by fate. Both cuples meet still children.

Korean drama, japanese remake.
I caught myself hooked on Two Weeks, the korean version I'll try the Jdrama too

Almost the same plot these two: multiples male leads falling in love, bla bla bla etc.
P.s.: Nakagawa Taishi act in both.

- First love theme
- FL can't keep calm in front of injustice
- ML that at the beginning won't care much for the others, but got caught wanting to
involve FL's issues
- ML start to change the way he face his family because of the FL
- ML treat problems more using logic than the FL
- The main couple trusts each other
- despite the protagonist have high grades he is not shown as perfect as the other idols dramas.

^-^

Synopsis remind me a lot one from another.

If you've like this one of these better check out the other ^^