BTS
This Heart Of Yours
by Onion_Path
Although he wasn't born in a wealthy family, Kim Seokjin’s parents sold everything for their son to keep on living until the very end of time, with a low-quality, mechanical heart in need of maintenance. (Or: In a world in which inmortality is made possible by the development of mechanical organs, watchmaker Jeon Jeongguk is in charge of Seokjin's mechanical heart mantainance.)