Board Thread:Questions and Answers/@comment-25958552-20160825130425/@comment-29690476-20160825151418

These humans arrived at underground after Asgore and Toriel dicorced(Toriel have seen many human come, leave, and die). At least after Asriel was dead because only after that Asgore declared war. Gaster seemed way ancient then all these events. Well.. Alphys might guided these humans, just as what she do to frisk.