Which episode is Yangko and Sea Cat's Recognition of Mother?

According to the query of Douban film, in the fourth episode of Yangko, the sea cat appeared at the scene of playing Yangko in Hutouwan, holding Yu Pei in his hand to find his mother. Yangko: Yang Zhigang, Andy, Yue Lina, Wang Kuirong, Wang Huichun, etc. Synopsis: The story takes place on the eve of War of Resistance against Japanese Aggression, and the young sea cat who lives by fortune telling and begging has a very tragic life experience. His parents belong to Wu and Zhao in Hutouwan, but the two families have been enemies for generations because of "playing yangko" and do not marry each other. Children born to those who dare to commit adultery will sink to the bottom of the sea. At that time, his parents sacrificed themselves to save him, but the sea cat was saved by fate.