Blood Type B, Wet and Hot Sister-in-law

Min Soo's younger brother Kyung Soo says he goes to sleep at Min Soo and Young Hee's house as usual. Due to Young Hee who is busy on business trip and Min Soo who went out for work Kyung Soo while being in the house alone suddenly meets Young Hee's younger sister Ga Hee, who suggests having a beer to resolve the awkwar…