A more mature BL drama that blends cute interactions and a suspenseful plot masterfully. The relationship between the main characters is very past faced, but this is made believable through the fact that they've been getting to know each other online and thus know each other quite well already. The drama is quite mature, with very suggestive scenes and load of blood, but it never felt cheap or done this way for attention grabbing as it fits well with the more mature mob plot.
The mob plot stays pretty surface-level, but it's well balanced and thought through with the flashbacks used.
I also adored the sister character.