Ame ga Furu to Kimi wa Yasashii (2017)

I recommend this both drama because , Male lead and Female lead
try to solve problem
In one drama explosion and another student murder/suicide

I recommend this both drama because , Male lead and Female lead
try to solve problem
In one drama explosion and another student murder/suicide

There are no two couples in "Ame ga Furu to Kimi wa Yasashii", but both dramas revolve around infidelity.