Bad beat

Yeon-Jun, whose body is too weak to work, lives with a heavy sense of guilt toward his older brother Yeon-O, who helps him. Wanting Yeon-O to live his own life, Yeon-Jun deliberately speaks harshly to him. He heads to Las Vegas to fulfill his dream of beating the world's best poker (Hold'em) player, Deus, just once, win the prize money, and become independent.

But on his very first night in Las Vegas, he witnesses the murder of Anafa....

(Source: Lezhin, translated)