The Big Devil Is Actually Me

[Online games + open world + no harem + unhappy stories + time travel + hidden missions + the game integrates into reality] In order to see his sister again, Ye You accidentally traveled back to nine years ago, when the game "Goddess Resurrection" was launched for just one month. Accepting the reality, Ye You decided to enter the game with her sister to make plans for the future integration of the game world into the real world. However, he discovered that a bound ninth-level treasure [Demon King's Breath] appeared inexplicably in his item inventory. Monster: "Run quickly, the Demon King is here." Ye You: "..." Treasure Chest: "??? Am I free?"