Probably Destiny BTS x BTS

Along with being born with a special gift or power, a matching tattoo that you and your soulmate share will appear on your body at sixteen. No one really knows why either of these things happen. Which is why government scientists are preforming a top secret experiment on humans, making their powers stronger and studying the after-effects. They thought finding willing participants would be difficult but with a few under-the-table deals, they found enough humans to fill five camps.

or

Seven unrelated people join a secret government experiment and learn how to grow and overcome their traumas by helping each other.

or

Namjoon decides that joining an experiment he shouldn't know about is the best way to meet all his soulmates.

LOOK IN FIRST CHAPTER FOR TRIGGER WARNINGS AND DISCLAIMERS!