Devil Sister Episode 17

Inn told Grandpa she knew Irin was not her real sister. Grandpa immediately realized that it was Jin who told Inn about it and he scolded Jin. Irin returned home and told Grandpa about her doubts and dissatisfaction, Grandpa blamed Irin for not feeling thankful. Namcha told his parents he wanted to marry Irin but was strongly opposed by his father who already knew that Irin was an adopted child. Inn asked Grandpa to arrange an engagement between her and Namcha. Grandpa talked to Namcha's parents about the marriage of Namcha and Inn. Namcha ran to Inn and asked her to cancel their engagement, but Inn rejected. (Source: Viu)