Secret Adventure

Lin Xu'an and Lin Xutang are a brother and sister whose hobby is adventure; the elder brother Lin Xu'an is brave, and the younger sister Lin Xutang is observant. Mu Ying and Mu Ying are a pair of sisters, their hobbies are exploration and adventure; the elder sister Mu Ying is outspoken, but must repay kindness; the younger sister Mu Ying is timid, but has a lot of adventure knowledge. (There are multiple authors of this short story)