The theme is actually very simple, in my opinion, seek common ground while reserving differences and always be full of love. After the baby was born, the family wanted to give him a better life. Grandpa wanted to live with everyone and firmly believed that his grandson was a vampire bat. His mother thought that her son was not a monster but a normal person, so she decided to move out of the hotel. Finally, at the little guy's 5th birthday banquet, his great-grandfather was invited to come. Because someone bullied his friend, the little guy grew fangs and became a real bat. Everyone still stayed in the hotel, and the ending was perfect.
In short, there is love in the heart.
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