Chapter 21 of John's book is under speculation. Chapter 20 contains references found in other gospels. Our bible as stands today reports the following personages in chapter 21:
Simon Peter, Thomas (also known as Didymus[b]), Nathanael from Cana in Galilee, the sons of Zebedee, and two other disciples were together. (vs. 2)
These guys were all out fishing. There was a man on the shore, Jesus. Jesus told them to cast out their nets and they would be filled. Jesus further instructed the men on being fishers of men and feeding his sheep. He specifically instructed Simon Peter regarding sheep. References are made to John (one of the two sons of Zebedee, the other is James) as if John is a particular prize of Jesus' that he might be saving for something special.