Yes, he and his junior brother were both from Carefree Manor, and Shenxing was a Carefree Disciple. Sending him back to the sect to learn the arts seemed reasonable and proper.
He wasn't shirking responsibility but felt that by going to the sect and formally taking a master, he could receive systematic and comprehensive training.
So, He Yichong said farewell to Kang Shenxing and took him to Carefree Manor.
At this time, the Carefree Manor was headed by He Yichong's senior sect brother, "Carefree Immortal" Bei Mingzi, as the manor master.
Bei Mingzi had a good relationship with both He Yichong and Kang Yimo, so He Yichong entrusted Kang Shenxing to him with confidence.
Bei Mingzi remembered his friendship with Junior Brother Kang and took great care of Kang Shenxing, his nephew.
But having grown old and being preoccupied with the manifold affairs of being the manor master, he entrusted the teaching of Kang Shenxing's martial arts to his eldest disciple, Kun Peng.