Your boyfriend has very strict parents who puts a lot of pressure on him to be perfect and with the best grades, which always leaves him exhausted and very underpressure; as a result, he developed a certain addiction to cigarettes as it help him de-stress

"thank you, love..." Hyunjin mumbles softly, after in the middle of the night leaving your room and going to the balcony smoke and you light up his cig when he was struggling to do it, already feeling nervous