Researchers have studied Korean amwu- and nwukwu-, focusing on their semantic differences (e.g., the property of domain widening, vagueness, etc.). In many environments, the negative sensitive items (NSIs), amwuto and nwukwuto, exhibit similar syntactic behaviors. However, such a parallelism breaks down when they appear as remnants of clausal ellipsis. In order to account for this, we assume the following points: i) the Pol head at the far left, ii) Σ1, which bears a regular polarity variable, above FocP, iii) Σ2, designated for a light polarity (Ladusaw 1979; Schwarz & Bhatt 2004), above TP, and iv) low NEG, which hosts morphosyntactic negative expressions spelled-out inside TP (cf. Gribanova 2017). Given this, we propose that amwuto and nwukwuto are licensed by two distinct heads in narrow syntax (cf. den Dikken et al. 2000): amwuto is licensed by Σ1, while nwukwuto is by Σ2. Additionally, we argue that the derivational approach to ellipsis suggested by Park (2017) is necessary to capture the identity condition on ellipsis.