1. A piece of iron (or an ore, alloy, or etc) that has its component atoms so ordered that the material exhibits properties of magnetism, such as attracting other iron-containing objects or aligning itself in an external magnetic field
2. A person or thing that has a powerful attraction
In episode 9, Hyung-kyu (Ding Dong) is at Dokko’s home and has brought along a pair of Pororo magnets: a boy one and a girl one. He asks with a mischievous grin if Dokko wants to be stuck together with his aunt like his magnets. Dokko explains that he thought he did and was drawn to her due to some sort of powerful force. But now that that’s gone, he doesn’t want to anymore. He flips the magnets so that they repel each other, proving his point. Ding Dong doesn’t believe him, and holds up the magnet to Dokko’s necklace, saying that it still sticks (Oh, you smart boy, you).
When Ae-jung comes to pick Ding Dong up, Dokko invites her to have a talk with him. He uses the magnets to show her that he (the boy magnet) has been pursuing her, and she (the girl magnet) has been running away. He continues demonstrating with the magnets, and says that the tables have turned. He’s going his own way while (snap!) she sticks to him, and is being pulled by him. Ae-jung is terrified and exclaims, “She must be crazy. Why is she being pulled by him??”
He notices her reaction, and is smugly delighted in the fact that she is drawn to him. She argues that she was speaking on behalf of the magnet, and not herself. Dokko wants to see if she’s lying or telling the truth, and urges her to put on the heart-rate monitor. She slams his heart-rate monitor on top of the magnets, making the monitor go haywire. They are unaware of this though, and Ae-jung runs out of there with Ding Dong, as Dokko continues to gloat.
Ae-jung goes home and plays around with the magnets. When the magnets suddenly snap onto each other, she is startled, and throws the girl one onto her bed.
Later on in the episode, she goes to Dokko’s house and confesses that she is disappointed that he doesn’t like her anymore. Dokko asks if she really is that disappointed, and also attracted to him. She confirms it by saying, “Yeah I am, and being this close to you makes me want to stick to you like a magnet,” and proceeds to hug (or snap) to him tightly.
Even though the children’s toys/objects (lie detector, magnets, diary) are used by Dokko to initiate the analogies, it is actually Ae-jung who always ends up being affected by them, gradually leading her to discover her feelings for him. Even though Dokko encounters them first, the magnets serve as a catalyst in Ae-jung realizing how much she is attracted to Dokko. She can’t deny that she is drawn to him, and that he has been pulling her in deep. She sees truth in the behavior of the girl magnet, and is extremely unsettled by it at first, refusing to believe it. However, she later uses the magnet analogy to reveal her truth and express her feelings to him. She has come to accept them at this point, thanks to the help of the magnets. These magnets are significant because they’re what leads Ae-jung to snap (physically and emotionally) and become the pursuer.
Also note that the magnets play a part in messing with Dokko’s heart-rate monitor, which later leads to him realizing that his love is not just a physical or scientific condition but an emotional one. He really does like her and that he needs to rely on his heart rather than his monitor.
Thank God for the magnets!