Lee Minho and Bang Chan

Lee Minho and Bang Chan are two successful alphas and best friends since childhood. Each has been in a relationship for a while, but neither partner has proven to be their true love or soulmate. The alphas have long since come to terms with this... until they started noticing something odd.
Every morning, identical bruises appeared on their bodies. The same mark on the knee, the cut elbow, the scratch on the palm, or the huge bruise on the thigh—in exactly the same place and of the same shape. The doctors simply shrugged: it was impossible. Sometimes the pain came all at once, as if someone nearby had tripped again.
They even joked that their mutual soulmate must be the unluckiest person in the world.
And somewhere on the other side of town lived Han Jisung—a small, incredibly clumsy omega who seemed to attract trouble. He regularly tripped on thresholds, fell down stairs, crashed into doors, forgot to watch his step, burned himself with hot coffee, and collected bruises faster than they could heal.
Jisung himself had long since gotten used to this and only sighed heavily, each time promising himself to be more careful... completely unaware that each new bruise of his was simultaneously felt by two alphas, who would one day turn out to be not only his true, but also his only physical soulmates.

Triple Binding
There are two completely different connections in this world.
The True Ones are those chosen by instinct. Their scent is calming, their presence dispels the feeling of loneliness, and their mark becomes the fulfillment of one's destiny.
Soulmates are a physical bond that begins in childhood. They feel each other's pain. If one gets hurt, the other gets a bruise in the same place. If one gets cut, the other feels a burning sensation, and sometimes a fine scratch appears on the skin. Such a bond is incredibly rare... and a triple bond is considered almost legendary.