Ive been trying to finish quests in Magatia and i just tried doing the quest : "Zenumist and the Missing Alchemist" , where you have to visit : "Magatia: Home of the Missing Alchemist" , and then click on different NPC objects like pipes and books but some NPCs (and i checked) are unclickable so i think that it might be a bug or something , you have to click all the NPC clues in order to keep going with the quest , would love some help on the matter. thanks.
I've done this quest a few weeks ago, it should still be working as intended. I think you are at the part where you need to talk to the painting on his desk? Either way, i suggest you to restart the quest, and this time read what the guy is saying, he might give you a clue. If its the part with the pipe, clicking them would either tell you that you rotated the right pipe, or that you rotated the wrong one and the code resets. If you dont get those messages then you aren't in that part of the questline yet
I believe I used this video for guidance: It's obviously a different version of MapleStory but the basic principles apply. Make sure to do every part mentioned in the video.