Gongfu Si Xia: Yong Chuang Digong

Synopsis

The four kung fu heroes who have the ability to enter the earth are going to the underground palace of Haibang Island to find the treasure of immortality. There are countless unknown, dangerous and deadly strange animals and plants on Haibang Island. They work together to finally reach the magical and magnificent mysterious underground palace and solve the puzzle mechanism leading to the treasure. The danger waiting for them is pressing on... The Four Heroes of Kung Fu: Courage to the Underground Palace (translated from douban)