After traveling through time, the four best friends were all targeted by the boss

Group travel + multiple CP + ancient imaginary world. Four best friends travel together, but because they save an old man, he sends them to a book called Save the World, and they meet the four male protagonists recorded in the book; others are souls that travel into the bodies of princesses and noble ladies, but they are not only souls that travel into the bodies of princesses and noble ladies, one of them almost drowned, one fell into someone else's bed, one met bandits, and one was almost kidnapped. Not only that, they are also forced to deal with the heirs of the four strongest families on this continent. How can they avoid conflicts? Not only that, these four men actually want to capture them? Because they are destined to leave, the four have been suppressing their emotions, but they didn't expect that...