Double-Sided Sword

(Single heroine, slow to warm up, decisive and unsatisfied in killing. Please forgive me for the poor writing style of the new author.) The nameless sea, the sleeping unknown existence, is wrapped by a beating heart that changes shape and gives birth to countless strange things. Yang Yule was originally an ordinary college student, but he picked up a weird Rubik's Cube and was taken to a strange and weird world. What story will happen in this weird world? Also known as "I have two personalities, killing gods in the world of immortality" and "Journey on Two Sides" fantasy novel