What Do You Do When You Suddenly Become an Immortal? is a Manga/Manhwa/Manhua in english language, Manhua series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

When your soul goes into others, others are also going into you. On this day, Lin Fan and the Saintess transmigrated at the same time, and later found out that they could transmigrate infinitely! Constantly going back and forth between the two time and space, the two's chaotic journey through the immortal cultivation began. "Excuse me, your name is..." Note: Kimi no Na wa (Your Name) meets Xianxia