Sans just saw Kağan waiting them near the statue who looked like himself. Sans was happy to see his friend after 2 years and they need to tell themselves a lot of thing. Sans returned the Master Sword to its pedestal. That is a ritual for hero who completed his/her quests for saving Hyrule. Then they went to Faron Willage and Sans told everyone goodbye personally. Then two time travelers entered the cartoon box rigth before it dissapeared. Sans told Kağan about his journey and Kağan told his own. Then, they saw a weird letter which had a insigna too similar to Kağan that he couldnt resist the invitation