Hidden Sword and Pure Heart

In the troubled frontier, the boy lived like a wild dog for three years. Master Hidden Sword Valley found him, accepted him as his disciple, gave him warmth, and said to him: "From now on, this is your home." The boy believed it. He gave his life to the Master and his heart to the Master. But he didn't know that his master's life was about to end and his meridians were cut off - he accepted a disciple just to seize his body. Deep in the secret realm, Yun Su returned to his place. Can pure swordsmanship break this deadlock?