ovl_En_Mk is the Lakeside Laboratory Professor actor.
Debug Rom Notes
ROM: 0xE62B68 (24060025) Receiving the Eyedrops from the Professor to bring them to Biggoron.
ROM: 0xE62BC0 (24060025) If you fail the first time, perhaps?
ROM: 0xE63068 (2406003E) Receiving the Heart Piece for diving to the bottom of his pool.
ROM: 0xE630C4 (2406003E) As above? (Study the SPOT between these two!)