Imo they did go beyond that initial premise. From Sak’s flashbacks it’s seen that he was always treated as an outcast, as something flawed. He was happy when the old man treated him kindly, which meant he wanted affection and acceptance after all. The only one who provided that in all his life unconditionally was Lima (not unconditional at first of course). This was a flashback after they destroyed the transmitter too so it wasn’t even about a caller anymore. That’s why in his monologues, he insists that he only acts for and only for Lima. Their relationship has transformed beyond, that’s why in the epilogues they are still loving, they no longer rely on a caller’s effects but love.
I read the story until the end. The "caller-bond feelings thing" didnt change. They literally explained this when Ml broke the transmitter. Basically, the "forced bond" was still there. Only thing that changed he no longer could feel his emotions or thoughts. Yes at the end, they are "happy" because Sak is only capable of likimg Ml and Ml is happy to someone who will love him unconditionally. But like i said, this doesnt feel like love to me.
I thought the broken transmitter meant the caller effects no longer work? It said that the effects should disappear over time, literally explained that Lima would no longer be a caller, since he was artificially made one through the transmitter. It said the only real caller was Nana, Hana's sister. So I assume that no longer reading thoughts meant no caller effect, and little changes meant that their relationship was already beyond the caller effect.
I thought so too but they said the "devotion" etc doesnt change when the transmitter broke. Hana and Nana situation is different because they are family so its natural them to love each other anyway but in Saks case, he is stranger and this devotion is the only thing he can feel. Why? Because he is born like this :////.
Well, I can your point, I think it's hard to actually tell whether that die-hard devotion Sak shows is from the caller as it really did start that way. I guess in this case it can go both ways tbh
Unpopular opinion: Even thpugh its kinda realistic sci-fi bl story, i cant take their "love relationship " cute because Sak is literally born to love him. Like, some broken robot who only serve his master. Seme also started to love Saks unconditional devotion. Basically, their entire relationship is fake. I kinda wished they went beyond that but they didnt. The fact that they or any other character dont have any kind of morality didnt help either. Anyway, not bad story but i think its also missing logic and idk a little more sincerety between mc and ml.