Theoretical light curves of the merger-nova emission, across several common optical/NIR filters, considering opacities of κ = 0.1 (left panels) and 10 cm² g⁻¹ (right panels), representing the lanthanide-free and -rich ejecta cases, respectively. KN emission without any magnetar spin-down enhancement is shown for comparison (dotted lines). The model fixed parameters are P_i = 5 ms, ξ = 0.3, and η = 10⁻³, along with two adopted ejecta masses of M_ej = 10⁻⁴ (solid lines) and 10⁻² M_⊙ (dashed lines). The upper and lower panels adopt magnetic field strengths of B_p = 10¹⁵ G and 10¹⁶ G, respectively.