The Rookie New King Is Ordered to Take Over

I get dragged to another world, forced to impersonate a twin brother I've never met, and made the new king? And I have to help my big brother marry his betrothed? All for some greater good, to take over and protect the world? You've got to be kidding me! I, He Changsheng, just want a quiet life. There's no way I'm taking some random throne... Wait, damn! Sister-in-law, you're gorgeous~