Why did Caleb go to prison?

He took his adoptive brother's place to repay his adoptive parents.

What does he need to survive after release?

A rare constitutional match to cure his cultivation injury.

Beneath Ruin, He Returns Supreme (DUBBED)

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Beneath Ruin, He Returns Supreme (DUBBED) — Caleb Jarell trades five years in prison for his brother's freedom, only to emerge with a fatal cultivation injury requiring a rare constitutional match.

After taking his adoptive brother's place in prison, Caleb Jarell masters a potent technique that backfires and leaves him with a life‑threatening internal condition. The only remedy is a person possessing a unique constitution. Upon release, his adoptive parents pressure him into an arranged marriage with the wealthy Smith family. Inside the household he encounters the family's disfigured young heiress, whose hidden nature suggests she may be the exact match needed to save him.

Quick answers

Why did Caleb go to prison?: He took his adoptive brother's place to repay his adoptive parents.
What does he need to survive after release?: A rare constitutional match to cure his cultivation injury.