His Fake Heir

The 'fake heir' Leo Morgan learns he will lose everything after the real heir returns, causing him to panic and threaten a 'villain arc'. His older brother, Ian Morgan, has long known his identity and been secretly in love with him, protecting and indulging him. When Leo gets into trouble, Ian comforts him and confesses his feelings. The family accepts Leo, the real heir steps aside, and comments send blessings. The two overcome their identities and stay together.