In the Original God, I Married My Sister at the Beginning

This book is also called - I am the strongest son-in-law in Teyvat! Ye Xuan, an ordinary two-dimensional fat man, has been a solo player for twenty years. By chance, he traveled into the world of Teyvat, held a marriage contract, and married Yingmei! But the damn system actually asked him to take a peek at Shen He taking a shower! Ye Xuan's reputation was ruined. Fortunately, Ye Xuan successfully activated the most powerful copy system! Not only can he copy other people's abilities, he can even learn the monster's special moves! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.