Looking at the raws, it seemed that Su Luxia had to get out of this world's body. I think that this ML also has a system or something magical since he had a recording (?) of her talking to her system while rolling around in bed. In the end, Su Luxia jumped off a cliff, the ML followed, but before she died, her soul went out of the body. The ML had this crazy look in his eyes when he caught her soulless body. He's probably a yandere (?). The epilogue that Su Luxia sees is that the ML kept her soulless body in ice & is still there. He kisses the ice where her lips are & probably saying something crazy.