Sentimental Lovers

Genius artist Si-Uk was always lonely—friends envied him and adults tried to take advantage of him. If there was even one person who understood and hugged him, Si-Uk was ready to give them everything. And, eventually, Si-Uk met two men who understood him: Ryu Sin-U, a perfect man who seems to have never felt lonely; and Song Ji-Sin, who has tried harder than anyone else to avoid being lonely. The two men engage in a war of nerves to take over Si-Uk's heart, but the most dangerous man among the three is Lee Si-Uk...?

(Source: Lezhin, translated)

Note: Chapter count includes two extras.