The protagonist was kicked out of his home when he was young, his mother is unknown, and he was called a bastard.
Once when he was begging, he met an immortal who tested his spiritual roots. The male protagonist had a single spiritual root of the fire system. He obtained the Immortal's Dharma Eyes and was brought into the Taicang Sect. He became a disciple of Elder Xuan Feng and became a closed disciple.
The heroine is the daughter of the sect leader. She was the only one the sect leader had during his years of cultivation. She is strictly disciplined and trained according to the master's path. All sects are top priority.
During a trial in a secret realm, the protagonist found out a little bit of information about his mother, and felt troubled. Then he walked in the world of black and white, looking for his mother.
Finally, the protagonist returns to where he belongs, and the heroine takes on the responsibility of being the leader! We are strangers to each other.
I won't tell you the follow-up, everything is explained in the text...