Here are a few:
1. Exclusive No-Love Zone (Yaoi) [It has very light smut only in Epilogue chapters]
2. Psycho (Young Dream) Webtoon
3. Where the Dragon's Rain Falls
4. Thick as Thieves
5. 18 Unlimited
6. Your distance
7. My Cute Junior Turned into a Guy
8. Demon wants to hug
9. One Step From The End
10. To be or not to be
11. Salad days
12. 100 Ways to Heal a Psychopath
13. Two&Too
14. Wolf Butler and His Cat Master
15. Starry Night
16. Friends at First
17. Heart stain
18. Perfect Replacement
19. Confession cheonghu
20. One Kid, Two Dads
21. Anaerobic Love: Prisoner of the Deep Sea
22. Picking Up the God of Wealth to Take Home
23. I work for all
24. Fragile relationship
25. More than Brothers
recommend me some good shounen ai manga that is not popular bec ive read all the popular ones