What did he catch ?

Yu Mai who did not understand how him catching fish turned to his brother-in-law kneeling was turned speechless. What was going on? He just wanted to have fun, why were they betting like this? 

He turned to look at Ye Liu and tugged on his sleeves, "Brother-in-law Liu, what if I cannot catch fish?" Yu Mai was raised well by Yu Dong in the past year but he was still timid and scared. The day when he was thrown to the restaurant after being sold was still firmly imprinted in his mind. What if he made his brother-in-law kneel and his sister got angry? 

Would she not throw him away? His sister loved his brother-in-law and she would be definitely angry with him if he was to fail.