Drowning in Double Tenderness

The two male protagonists are twin heirs of a wealthy family. They are born with the same physical and emotional emotions. They have been inseparable since childhood and have the same thoughts. After meeting the heroine, the two fell in love at the same time. One was reserved and gentle, the other was overbearing and domineering, but they had exactly the same heartbeat and possessiveness. The two of them work together in a tacit understanding and treat the heroine as an exception. Outsiders can't tell who is whose preference. Only the three of them know that they are symbiotic souls and share one person.