Hold One's Breath And Die

"Don't speak a word of this request." Under that condition by his client, Seo goes to do a house call for aquarium maintenance. There, he meets a boy named Riku, who knows nothing about the outside world. Each time he goes to Riku's, they get closer. Unbeknownst to Seo, Riku begins to innocently desire him. One day during that period, the client suddenly ends their contract.

(Source: Renta!)