Try 'True Beauty'. It has a similar light-hearted and romantic tone. The art style is also appealing, and the storylines keep you engaged like in Sweet Guy.
One manga similar to Sweet Guy could be 'Love So Life'. It has a similar sweet and heartwarming tone.
One that comes to mind is 'Lookism'. It shares some similar themes and art styles with 'Sweet Guy'.
There are a few like 'The Promised Neverland' and 'Tokyo Ghoul'. They both have elements of mystery and survival.
One manga that might be similar is 'Ouran High School Host Club'. It has charming characters and a lighthearted tone.
Well, 'Love and Lies' could be one. It has a similar theme of complex relationships and emotional turmoil.
It has a unique art style and an engaging plot. The characters are well-developed and the story keeps you hooked.
It's likely to contain explicit and adult-oriented content based on the description.
There are several, like 'True Beauty' and 'Lookism'. They share similar themes of romance and character development as Sweet Guy.
I think 'My Love Story!!' might be similar. It has a similar charming and heartwarming vibe.
I think 'Lookism' could be similar. It has similar themes of personal growth and interesting character dynamics.