MTL - I Really Don’t Know How To Practice - Chapter 41 sister is here

Fate, a gatekeeper who had been working for the castle, is beset by a few burdens.

After breaking up with his girlfriend, he accidentally acquired a genius system and rose from there against the heavens, becoming invincible..

- Description from Novelupdates

A car accident left Mu Lan, who was about to get a divorce, with sudden amnesia.Gazing at the strange man before her claiming to be her husband, Mu Lan was speechless. Could her taste really be that terrible that she chose a man with a poker face?“Whether I was blind or out of my mind before, since the heavens have granted me amnesia, this is an opportunity to start anew.So, this marriage, I'm definitely ending it!”However, no one can escape the so-called 'True Fragrance Law.'Not only did she fail to get the divorce, but she also ended up investing herself into it....Tingxiao never expected to suddenly find charm in the woman he had married for seven years and hardly bothered to look at more than once, all because of her amnesia.But even though they had agreed that once her family overcame their difficulties, they would go their separate ways, he found himself unable to let go.“Tingxiao, you're shameless, breaking your promise and growing fat from it.”“If I'm fat, I'm fat; for my wife, I accept it!”

Finding himself in an Last Airbender without an airbender around, a transmigrator waterbender goes on an adventure to stop the worst from happening to him.