help Me find the manhwa

Can you find the bl manhwa with the plot where it was this older singer songwriter dude and this younger dude that made music and his mysic was about yearning and obsession and then they both went on an idol show together with the older dude as one of the judges to get the younger dude to become more famous the uke was brown haired the seme was black hairedit gets revealed That the younger dudes songs were about the okder dude