The couple are very green flags, kouhei and taichi has problems but does not always resolve in a just talking but also give time to each other. Additional kouhei may kiss taichi in his according but does not step on taichi's boundaries, the two may have misunderstanding but they resolved it with communication and time to figure out.
This story deserves more recognition because how detailed the character's personality and stories are. As much as we want just "happy story" in our life does not mean we can forget about the problems that may already exist or will come. I love how detailed the story is, if you take it in heart you'll understand too.
Don't jinx it bae, you'll be one of my the "marinate" manhwa at this point