Whale Fall

Pi was very surprised, as Zhang Zian had never revealed any thought about going out on the sea on a boat. Even Zhang Zian himself was surprised.　　

It was just a spur of the moment decision. In fact, he didn't have reasons to go out on the sea on a boat, but after he saw that giant whale, he could no longer hold back his curiosity. It was very dangerous for a giant whale to come so close to the shore, as it could strand itself with a slight carelessness. It only belonged out in the deep blue sea.

What made it to approach the shore against its survival instincts? Was it Sihwa's songs? Or was it hurt, too?