Left: 2MASS K_s band image (gray-scale) and ¹²CO(2–1) emission associated with the blue and red lobes of IRAS 15398-3359 (blue and red contours, respectively). The source 2MASS 15430576-3410004, located in the left bottom corner in the image, could be driving the ¹²CO(2–1) emission detected southeast of IRAS 15398-3359. The red ellipses indicate possible ejection interacting with the gas in the vicinity of IRAS 15398-3359. The black circle indicates the region zoomed in the right panels. Right: velocity channel maps of the ¹²CO(2–1) emission (color scale) near the cloud velocity. SO(6₅, 5₄) and C¹⁸O(2–1) moment 0 maps are shown in black and pink contours, respectively.