'Love Alarm' Season 2: Is Brian really Chun Duk-gu? CDH being in contact with Gul-mi will reveal all secrets
The person behind the shield who allowed Jojo (Kim So-hyun) to keep her romantic feelings a secret from the world and from the love alarm app was her highschool classmate Chun Duk-gu. He was a lonely high school kid who had fallen for Gul-mi (Go Min-si) and had no means of expressing it to her and instead founded the app. However, when he finally manages to ring Gul-mi's love alarm, he is humiliated by her and that results in Duk-gu becoming cynical about love.
So he offers Jojo an option. He tells her that she can choose between a sword or a shield. She chooses a shield to stay safe and that is how her app gets a shield that doesn't work like everyone else's app. After spending a considerable amount of time with Hye-young (Park Ga-ram), and despite her confidence that she has begun to like him too, she is unsure because of Sun-oh's (Song Kang) reappearance in town. She still falters around him and that was visible when he had kissed her.
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However, the last we saw of Duk-gu (Lee Jae-eung) was him jumping from his room and there has been no news of him since. The founder who claims to also be the co-developer of the app tells Jojo when she approaches him that Duk-gu is not around anymore. There seems to be a huge secret here as Brian seems to be aware of all the key players in Duk-gu's life but no one can make out who he could be, not even Duk-gu's friend Jojo. After learning that the shield cannot be removed, she is desperate to do something and that is when she ends up receiving a spear.
A spear that allows her to ring the alarm of anyone that she chooses manually. It is this spear that she uses to make Hye-young feel secure and rings his alarm but only after she had come to the realization that she had fallen in love with him. However, when Hye-young learns that she had not been truthful about this entire incident, he becomes distant. The more Jojo wonders who had sent her the spear, the more she wants to speak to Duk-gu and she realizes that there is something fishy about Brian.
In the meantime, we also see Duk-gu receiving mails from Jojo sometime in the past, hinting at the possibility that he had probably not died. We also see Brian find out about the spear and wonder what Duk-gu had done while looking at the screen in which a person seems to be hospitalized for a serious medical condition. So who sent Jojo the spear? Gul-mi was also in touch with someone who went by CDH, which we believe could be Duk-gu as this person sent Gul-mi a gift -- a map of everyone who uses the app, and statistics that allowed her to track individuals who may be interested in giving her a heart on the app.
Even as Brian tries to keep an eye on any activity that he believes is by Duk-gee, we wonder why there is so much mystery around the founding of the Love Alarm app. Interestingly, it is Duk-gu who helps Hye-young understand that Jojo's feelings for him were real and sincere. Turns out, he was not dead but just away from the limelight trying to prove to his brother that Love Alarm 2.0 should be given up. The two seem to have disagreed with the direction that the development of the app must take, leading to all the mystery surrounding the founding of the app. Duk-gu's attempt at suicide did not succeed, but it definitely gave him the chance to understand how love works. He also suggests to his brother that they should see Jojo's case as an example to help them focus on further development because she was able to change the person that she liked after the shield was added to her app.
'Love Alarm' Season 2 premiered on Netflix on March 12 and all six episodes are available to stream.