Suspicious Companion is the title of Elsword: El Lady episode 2 and continue where the story left on episode 1.
After Add rescues Eve from falling to the ravine, he introduces himself as a Nasod researcher. Elsword heartily welcomes him to the group but Elesis remains suspicious of his intentions. To travel further towards the Temple of Water, the party splits into two groups to avoid potential traps from demons. However, a powerful stream of water begins to flood their paths and interrupts their journey.
You can watch it on YouTube in this list: Elsword: El Lady animation episode 02