Was Ma Lin happy in his life? Very happy.
Fei Shu was still chasing the mosquito person in the Godblood Plains, the latter being one of several bodies used by Ni Xiong, possessing Ni Xiong's brain, experience, and formidable combat abilities, and had gained considerable strength in the Godblood Plains, making him tough to deal with.
Finding someone in that kind of place was extremely exhausting, especially if the person was cunning, skilled in battle, and hiding in the shadows. It was very likely that an attempt to kill him could end with being killed instead.
Ma Lin used to be filled with fear of Fei Shu, but Fei Shu had integrated very well into this new era, and Ma Lin did not want any harm to come to him.
Coming to help in the Greenwater Hills was a request put forth by Fei Shu's most capable assistant, and Ma Lin felt that he should not refuse, so he came.