What does childlike innocence mean?

Have you ever seen a hidden cave? Tong Xin is the younger brother in the TV series Water Sky. He is the only one in the Tong family who can talk to animals, but his childlike innocence still exists. After accidentally drinking the blood of the blood python, they became brothers with the blood python and called Yin Zhong a master. Because of misunderstanding, Yin Tianchou killed the blood python and Yin Tianchou was seriously injured. Later, Yin Zhong used it to deal with Tong Bo and Zhan, which opened his eyes and learned magic.

? -Provided by Aipai SMS.