After Marrying the Alliance, the Eldest Prince Finally Became Single

[Two male protagonists + typical ABO protagonist + spiritual beast transformation + interstellar + twins + marriage first, love later] The first thing Lu Congsu did after his rebirth was to blow up his hometown and send all his enemies to the sky. The first thing Mercier did after his rebirth was to join in the fun and retrieve his wife from his previous life from the star field.