ss1 shows how uke (Haesoo) is changing, I wonder ss2 will show us how seme (both Joowon and Taku) change? Besides, I am quite confused about the timeline. I used to think chapter 38 is a day after he came Taku's house but it seems I was wrong, it was still that night. And the last chapter, it's about 5.30am in the morning, Haesoo says he should leave but Taku invites him breakfast right?

Because it’s about chapter 40 so I put it in spoil
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I think chapter 40 putting a lot of opposite things. Joowon filmed the hot scene while Haesoo and Taku made love. They both will have a photoshoot with Taku, Joowon’s concept is holiday (something funny, happy) while Haesoo is lost love. Joowon is alone in Haesoo house while Haesoo wakes up at Taku’s house ... I don't know why but maybe the author hides sth in it. There is no Haesoo’s internal monologue thorough the entire chapter is also a noticed point.
About why Haesoo still lied to Joowon. I think he probably doesn’t think so much. He took the phone, got a message, answered very quickly before Taku called. I think Haesoo still acts in the habit of answering arbitrarily with Joowon. From the beginning (chap 28 or 29), Haesoo wanted to hide everything about Taku so lying is the simplest way to end all further questions. I think Haesoo has feeling about Taku, but it’s really new for him and he is not sure about it.
This chapter makes me have a strong feeling that three of them will separate at the end ( ̄∇ ̄").