Yeon-woo knew that Akasha's Snake grew by feeding on Akasha. But he never thought that feeding would also help it resurrect. Yeon-woo finally saw a ray of hope. In fact, depending on how he handled the situation, the outcome might even be better than what he had originally envisioned. The longer the snake spent on growing, the larger it would become, and along with that, the bigger its Neidan would be. He would then have a chance to absorb its full power. 

Yeon-woo’s eye glistened with anticipation. ‘Plus, this doesn’t go against the quest’s directive.’ 

The quest told him to stop the resurrection ceremony, but it didn’t set a deadline. In other words, he could complete the quest as long as he killed Akasha’s Snake before the ceremony ended. 'As long as the ceremony continues, I can keep making Akasha's Snake bigger and bigger. It won’t be too late to kill it once it reaches its full size.' 

Besides, there might be other secrets hidden inside Akasha’s Snake’s tunnel, and...