107 Chapters (Completed)
Sirens can only have one undying love for one person in their whole life. Humans use this characteristic to emotionally bind the Sirens to human soldiers, forming the world-famous Siren Squad.
Second Lieutenant Tang Yi’s twin brother, Tang Ya, was one of the captains of the Siren Squad, but died in a battle. Tang Yi was ordered to impersonate Tang Ya to control his brother’s Siren, Mercury, but he was found out just a few days after meeting. In order to protect the life of the Siren and continue to live his dream of being in the Siren Squad, Tang Yi and Mercury begin a happy(?) life in disguise as lovers.