My Depression-inducing List

Sadly not really deep, the whole story only scratches the surface.
The character development is slightly lacking, the oblivious younger protagonist got on my nerves way too often, the end felt rush, and the author could have blessed us with a tragic ending...but no. So not that depressing, but does have its moment.
Obviously I looked the tags beforehand, so no surprise there, just my personal tastes.
Despite its flaws, it was a really good Manhwa in the Drama Genre ^^

Chapter 18. Don't believe me? Uh-ohhh
Well, I'm weak towards animals, nature and non-human beings...