Just to resolve a misunderstanding and one sided view of YooRin's behaviour in last 3 episodes, I'll put this out. YooRin, even though from not perfect family is known be putting great deal of respect for family. So was the case for GongChan. This would explain why YooRin's had a hard time accepting GongChan without Grand-Father's blessings. It was only when Grand-Father gave a go ahead, YooRin accepted GongChan's feelings.
But, an optimistic scene of them is shown at the end foretelling that they will meet in future.
It was pre-planned between Jin Hyung and Yo Han.
Yo Han lies in one of the questions which Seon Oh figures out by seeing tremor in his hand.
Hence, Yo Han loses the game.